Hi Weedhound, this morning the ph was still at exactly 6.0, and ppm still at 20.

I've added the 3 part nutrients to my res a few minutes ago, and after an hour or so it should be fully circulated in my system.

After adding nutes, the PH dropped to 4.8. I know I'll need to PH Up it after it's fully circulated. We'll see just how much later on.
MisterE Reviewed by MisterE on . PH Dropping quickly? I'm sorry to post this question, I tried to search but the term "PH" is too short for the boards search function... I'm having to PH Up my nutes more frequently as my plants grow. I'm wondering if this is considered normal, or if it is indicitive of any actual problems etc. I only use 8 to 10 gallons or so total (going to change it out and measure carefully today) and the plants are only about 10 inches tall, on their 8th node. I calibrated my continuous meter yesterday, and PH Up'd to Rating: 5